Safety Trailer

ABSTRACT

Differing embodiments of safety trailers are shown and described, the safety trailers having first and second platforms and a safety wall positioned therebetween. The platforms and safety wall define an area protected from vehicular incursions.

CROSS REFERENCE TO RELATED APPLICATION

The present application is a continuation-in-part of U.S. applicationSer. No. 16/421,350, filed on May 23, 2019, now abandoned, which is acontinuation of U.S. application Ser. No. 15/655,948, filed Aug. 1,2017, now U.S. Pat. No. 10,301,787, which is a continuation of U.S.application Ser. No. 15/019,124, filed Feb. 9, 2016, now U.S. Pat. No.9,725,858, which is a continuation of U.S. application Ser. No.14/324,720, filed Jul. 7, 2014, now U.S. Pat. No. 9,267,250, which is acontinuation of U.S. application Ser. No. 14/106,039, filed Dec. 13,2013, now U.S. Pat. No. 8,777,255, which is a continuation of U.S.application Ser. No. 13/913,868, filed Jun. 10, 2013, now U.S. Pat. No.8,628,110 which is a continuation of U.S. application Ser. No.12/713,822, filed Feb. 26, 2010, now U.S. Pat. No. 8,465,047 whichclaims the benefits of U.S. Provisional Application Ser. No. 61/156,319,filed Feb. 27, 2009, all having the same title, all of which areincorporated herein by this reference.

FIELD

The present invention relates generally to the field of trailers andother types of barriers used to shield road construction workers fromtraffic. More specifically, the present invention discloses a safety andconstruction trailer having a safety wall.

BACKGROUND

Various types of barriers have long been used to protect roadconstruction workers from passing vehicles. For example, cones, barrelsand flashing lights have been widely used to warn drivers ofconstruction zones, but provide only limited protection to roadconstruction workers in the event a driver fails to take heed. Someconstruction projects routinely park a truck or other heavy constructionequipment in the lane between the construction zone and on-comingtraffic. This reduces the risk of worker injury from traffic in thatlane, but does little with regard to errant traffic drifting laterallyacross lanes into the construction zone. In addition, conventionalbarriers require significant time and effort to transport to the worksite, and expose workers to significant risk of accident while deployingthe barrier at the work site. Therefore, a need exists for a safetybarrier that can be readily transported to and deployed at the worksite. In addition, the safety barrier should protect against lateralincursions by traffic from adjacent lanes, as well as traffic in thesame lane.

SUMMARY

These and other needs are addressed by the various embodiments andconfigurations of the present invention.

In one aspect, a system is provided that includes first and secondplatforms comprising at least one set of wheels and a safety wallpositionable between the first and second platforms to define an areaprotected from a vehicular incursion. The system further includes one ormore of the following features:

(A1) the safety wall rotates, by first and second arms, to either sideof the first and second platforms, wherein the safety wall has a heightof at least about 4 feet from bottom edge to top edge;

(A2) the safety wall has a height that is substantially the same as awidth of at least one of the first and second platforms, wherein thewidth ranges from about 6 to about 12 feet; [0008] (A3) a weight of thesafety wall is at least partially offset by a ballast that is movable,along a fixed path, from one side of the first and/or second platform tothe other side; [0009] (A4) the safety wall rotates upwardly from asubstantially horizontal position to a substantially vertical position;[0010] (A5) the safety wall rotates downwardly from a substantiallyhorizontal position to a substantially vertical position, wherein anaxis of rotation of the safety wall is horizontally offset from alongitudinal axis of the first and second platforms; [0011] (A6) thesafety wall rotates counter-clockwise from a substantially horizontalposition to a substantially vertical position; [0012] (A7) the safetywall moves from a first side of the first and second platforms to anopposing second side, wherein a first surface of the safety wall facesoutwardly when the safety wall is positioned on the first side and adifferent second surface of the safety wall faces outwardly when thesafety wall is positioned on the second side; [0013] (A8) the safetywall is segmented, with each segment being rotatable with respect to anadjoining segment; [0014] (A9) the first platform comprises an asphaltroller to engage a road surface when the safety wall is deployed; [0015](A10) the safety wall moves vertically from a first undeployed positionto a second deployed position, the vertical movement being directed by aguide mechanism engaging the safety wall and an adjacent one of thefirst and second platform; [0016] (A11) an inclination of the safetywall, relative to vertical, is adjusted about a substantially stationarypoint on the safety wall; [0017] (A12) the safety wall is displacedlinearly from a first side of the first and second platforms to a secondside of the first and second platforms; [0018] (A13) the safety wallcomprises first and second segments, the segments being slidably, butnot telescopically, engaged with one another; [0019] (A14) the safetywall slidably engages at least one of the first and second platforms;[0020] (A15) the safety wall comprises first and second segments, thesegments having first and second sets of holes, respectively, orientedtransversely to an exteriorly facing surface of the safety wall, theholes, when aligned, receive dowels to lock the first and secondsegments in position relative to one another; and [0021] (A16) at leastone of the first and second platforms and the safety wall comprise aguide mechanism that directs the safety wall into a desired position.

In a further aspect, a method is provided that includes:

(a) providing first and second platforms, comprising at least one set ofwheels, and a safety wall positionable between the first and secondplatforms to define an area protected from a vehicular incursion; and

(b) performing at least one of the following steps: [0025] (B1) rotatingthe safety wall, by first and second arms, to either side of the firstand second platforms, wherein the safety wall has a height of at leastabout 4 feet from bottom edge to top edge; [0026] (B2) positioning thesafety wall on a side of the first and second platforms, the safety wallhaving a height that is substantially the same as a width of at leastone of the first and second platforms, wherein the width ranges fromabout 6 to about 12 feet; [0027] (B3) moving a ballast along a fixedpath from one side of the first and/or second platform to the other sideto at least partially offset a weight of the safety wall; [0028] (B4)rotating the safety wall upwardly from a substantially horizontalposition to a substantially vertical position; [0029] (B5) rotating thesafety wall downwardly from a substantially horizontal position to asubstantially vertical position, wherein an axis of rotation of thesafety wall is horizontally offset from a longitudinal axis of the firstand second platforms; [0030] (B6) rotating the safety wallcounter-clockwise from a substantially horizontal position to asubstantially vertical position; [0031] (B7) moving the safety wall froma first side of the first and second platforms to an opposing secondside, wherein a first surface of the safety wall faces outwardly whenthe safety wall is positioned on the first side and a different secondsurface of the safety wall faces outwardly when the safety wall ispositioned on the second side; [0032] (B8) positioning the safety wallon a side of the first and second platforms, the safety wall beingsegmented, with each segment being rotatable with respect to anadjoining segment; [0033] (B9) when the safety wall is deployed,engaging a road surface with an asphalt roller on the first platform;[0034] (B10) moving the safety wall vertically from a first undeployedposition to a second deployed position, the vertical movement beingdirected by a guide mechanism engaging the safety wall and an adjacentone of the first and second platform; [0035] (B11) adjusting aninclination of the safety wall, relative to vertical, about asubstantially stationary point on the safety wall; [0036] (B12)displacing the safety wall linearly from a first side of the first andsecond platforms to a second side of the first and second platforms;[0037] (B13) positioning the safety wall on a side of the first andsecond platforms, the safety wall comprising first and second segments,the segments being slidably, but not telescopically, engaged with oneanother; [0038] (B14) positioning the safety wall on a side of the firstand second platforms, the safety wall slidably engaging at least one ofthe first and second platforms; [0039] (B15) positioning the safety wallon a side of the first and second platforms, the safety wall comprisingfirst and second segments, the segments having first and second sets ofholes, respectively, oriented transversely to an exteriorly facingsurface of the safety wall, the holes, when aligned, receive dowels tolock the first and second segments in position relative to one another;and

(B16) positioning the safety wall on a side of the first and secondplatforms, at least one of the first and second platforms and the safetywall comprising a guide mechanism to direct the safety wall into adesired position.

The present invention can provide a number of advantages depending onthe particular configuration. By way of example, the safety trailer canhave sufficient mass and energy absorption to resist, withoutsubstantial displacement, the kinetic energy from the impact. The safetywall itself can be made of any rigid material, such as steel. Lighterweight materials having high strength are typically disfavored as theirreduced weight is less able to withstand, without significantdisplacement, the force of a vehicular collision. Energy absorption canbe provided by shocks and inflated wheels. Preferred trailerconfigurations are not deployed on jack stands, which can minimizeenergy absorption by these mechanisms.

The safety wall or barrier (and thus the entire trailer) can be of anyselected length or extendable to provide a work area protected fromvehicular incursions. This can provide maintenance workers withsubstantial safety benefits while also providing enhanced driver safety.

The traffic-incursion side of the safety trailer, including anyelongated safety wall, can be substantially planar to avoid hang ups andsnags with an impacting vehicle. Hang ups and snags can direct morekinetic impact energy into the wall and/or cause the vehicle to flipover the safety wall.

The height of the safety wall can be high enough to inhibit entry of animpacting vehicle into the protected work area by climbing, flipping,and careening over the wall.

End platforms integral to the trailer's design can minimize the need forworkers to leave the protected zone and eliminate the need for separatemaintenance vehicles by providing onboard hydraulics, compressors,generators and related power, fuel, water, storage and portable restroomfacilities.

Optional overhead protection can be extended out over the work area foreven greater environmental relief (rain or shine).

The trailer can carry independent directional and safety lighting atboth ends and will work with any standard semi tractor. Directionallighting and impact-absorbing features incorporated at each end of thetrailer and in the rear platform can combine with the safety wall andimproved lighting to provide increased protection for both work crewsand the public, especially with ever-increasing amounts of night-timeconstruction. Optionally, an impact-absorbing caboose can be attached atthe end of the trailer opposite the tractor to provide additional safetylighting and impact protection.

The trailer can be designed to eliminate the need for separate lightingtrucks or trailers, to reduce glare to traffic, to eliminate the needfor separate vehicles pulling portable restroom facilities, to providebetter a brighter, more controlled work environment and enhanced safety,and to, among other things, better facilitate 24-hour construction alongthe nation's roadways.

The trailer can be designed to provide road maintenance personnel withimproved protection from ongoing, oncoming and passing traffic, toreduce the ability of passing traffic to see inside the work area (tomitigate rubber-necking and secondary incidents), and to provide afully-contained, mobile, enhanced environment within which the workcrews can function day or night, complete with optional power, lighting,ventilation, heating, cooling, and overhead protection includingextendable mesh shading for sun protection, or tarp covering forprotection from rain, snow or other inclement weather.

Platforms can be provided at both ends of the trailer for hydraulics,compressors, generators, batteries, water misters, water sprayers, pumpsfor liquid removal from the protected work area, fans, tool storage,related fuel, water, storage, and restroom facilities and otheramenities. The trailer can be fully rigged with direction and safetylighting, as well as lighting for the work area and platforms. Poweroutlets can be provided in the interior of the work area for use withconstruction tools and equipment, with minimal need for separate powertrailers or extended cords. Both the front and rear platforms canprovide areas for fuel, water and storage. Additional fuel, water andmiscellaneous storage space can be provided in an optional extendedcaboose of like but lengthened design.

Other applications include but are not limited to public safety,portable shielding and shelter, communications and public works. Two ormore trailers can be used together to provide a fully enclosed innerarea, such as may be necessary in multi-lane freeway environments.

With significant shifts to night construction and maintenance, thetrailer can provide a well-lit, self-contained, and mobile safetyenclosure. Cones can still be used to block lanes, and detection systemsor personnel can be used to provide notice of an errant driver, butneither offers physical protection or more than split second warning fordrivers who may be under the influence of alcohol or intoxicants, orwho, for whatever reason, become fixated on the construction/maintenanceequipment or lights and veer into or careen along the same.

The safety trailer can be readily, easily and conveniently deployable.The tractor can, for instance, be able to engage the hitch of the safetytrailer from multiple directions, rather than only from one specificorientation. The safety trailer can have an air ride on the rearplatform to permit either side or the entirety of the front and/or rearplatforms to be raised or lowered.

The safety trailer can have semi-tractor hookups at both ends and asafety wall that is fixed to one side of the trailer. That side,however, can be changed to the right or left side of the road, dependingon the end to which the semi-tractor attaches. A caboose can be attachedat the end of the trailer opposite the tractor to provide additionallighting and impact protection.

These and other advantages will be apparent from the disclosure of theinvention(s) contained herein.

As used herein, “at least one”, “one or more”, and “and/or” areopen-ended expressions that are both conjunctive and disjunctive inoperation. For example, each of the expressions “at least one of A, Band C”, “at least one of A, B, or C”, “one or more of A, B, and C”, “oneor more of A, B, or C” and “A, B, and/or C” means A alone, B alone, Calone, A and B together, A and C together, B and C together, or A, B andC together.

It is to be noted that the term “a” or “an” entity refers to one or moreof that entity. As such, the terms “a” (or “an”), “one or more” and “atleast one” can be used interchangeably herein. It is also to be notedthat the terms “comprising”, “including”, and “having” can be usedinterchangeably.

The preceding is a simplified summary of the invention to provide anunderstanding of some aspects of the invention. This summary is neitheran extensive nor exhaustive overview of the invention and its variousembodiments. It is intended neither to identify key or critical elementsof the invention nor to delineate the scope of the invention but topresent selected concepts of the invention in a simplified form as anintroduction to the more detailed description presented below. As willbe appreciated, other embodiments of the invention are possibleutilizing, alone or in combination, one or more of the features setforth above or described in detail below.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are incorporated into and form a part of thespecification to illustrate several examples of the presentinvention(s). These drawings, together with the description, explain theprinciples of the invention(s). The drawings simply illustrate preferredand alternative examples of how the invention(s) can be made and usedand are not to be construed as limiting the invention(s) to only theillustrated and described examples. Further features and advantages willbecome apparent from the following, more detailed, description of thevarious embodiments of the invention(s), as illustrated by the drawingsreferenced below.

FIG. 1 is a side view of an undeployed safety trailer according to anembodiment;

FIG. 2 is a side view of a deployed safety trailer according to theembodiment of FIG. 1 ;

FIG. 3 is a cross sectional view along a latitudinal axis of a deployedsafety trailer (the axis passing between the first and second platforms)according to an embodiment showing first and second wall structurespositioned on either side of the safety trailer;

FIG. 4 is a cross sectional view along a latitudinal axis of a deployedsafety trailer (the axis passing between the first and second platforms)according to an embodiment showing a wall structure positioned on afirst side of the safety trailer;

FIG. 5 is a cross sectional view along a latitudinal axis of a deployedsafety trailer of FIG. 4 showing the wall structure positioned on anopposing second side of the safety trailer;

FIG. 6 is a cross sectional view along a latitudinal axis of a deployedsafety trailer (the axis passing between the first and second platforms)according to an embodiment showing stackable first and second wallstructures positioned on either side of the safety trailer;

FIG. 7 is a cross sectional view along a latitudinal axis of a deployedsafety trailer (the axis passing between the first and second platforms)according to an embodiment showing stackable first and second wallstructures positioned on either side of the safety trailer;

FIG. 8 is a telescopic tube-in-tube wall structure member according toan embodiment;

FIG. 9 is a telescopic tube-in-tube wall structure member according toan embodiment;

FIG. 10 is a cross sectional view of a deployed safety trailer takenalong line 10-10 of FIG. 12 according to an embodiment with the wallstructure on a first side of the trailer;

FIG. 11 is a cross sectional view of the deployed safety trailer takenalong line 10-10 of FIG. 12 according to an embodiment with the wallstructure being moved from the first side to a second side of thetrailer;

FIG. 12 is the wall structure in isolation of the safety trailer;

FIG. 13 is an isometric view of the safety trailer;

FIG. 14 is a cross sectional view of a deployed safety trailer takenalong line 14-14 of FIG. 16 according to an embodiment with the wallstructure being moved to an undeployed position;

FIG. 15 is a cross sectional view of a deployed safety trailer takenalong line 14-14 of FIG. 16 according to an embodiment with the wallstructure being moved to a deployed position;

FIG. 16 is an isometric view of the safety trailer;

FIG. 17 is a cross sectional view of a deployed safety trailer takenalong line 17-17 of FIG. 19 according to an embodiment with the wallstructure being moved to an undeployed position;

FIG. 18 is a cross sectional view of a deployed safety trailer takenalong line 17-17 of FIG. 19 according to an embodiment with the wallstructure being moved to a deployed position;

FIG. 19 is an isometric view of the safety trailer;

FIG. 20 is a cross sectional view of a deployed safety trailer takenalong line 20-20 of FIG. 22 according to an embodiment with the wallstructure being moved to a deployed position;

FIG. 21 is a cross sectional view of a deployed safety trailer takenalong line 20-20 of FIG. 22 according to an embodiment with the wallstructure being moved to an undeployed position;

FIG. 22 is an isometric view of the safety trailer;

FIG. 23 is a cross sectional view of a deployed safety trailer takenalong line 23-23 of FIG. 25 according to an embodiment with the wallstructure being moved to a first side of the trailer;

FIG. 24 is a cross sectional view of a deployed safety trailer takenalong line 23-23 of FIG. 25 according to an embodiment with the wallstructure being moved to a second side of the trailer;

FIG. 25 is an isometric view of the safety trailer;

FIG. 26 is a plan view of a partially deployed safety wall according toan embodiment;

FIG. 27 is a plan view of an undeployed safety wall according to theembodiment of FIG. 26 ;

FIG. 28 is an isometric view of the deployed safety wall according tothe embodiment of FIG. 26 ;

FIG. 29 is a plan view of an undeployed safety wall according to anembodiment;

FIG. 30 is a plan view of a partially deployed safety wall according tothe embodiment of FIG. 29 ;

FIG. 31 is an isometric view of the deployed safety wall according tothe embodiment of FIG. 29 ;

FIG. 32 is a plan view of an undeployed safety wall with an asphaltroller-equipped second platform according to an embodiment;

FIG. 33 is a plan view of an undeployed safety wall with a sidedump-equipped second platform according to an embodiment;

FIG. 34 is a cross sectional view of a safety trailer, with anundeployed safety wall, taken along line 34-34 of FIG. 36 according toan embodiment;

FIG. 35 is a cross sectional view of the safety trailer of FIG. 34 witha deployed safety wall;

FIG. 36 is an isometric view of the safety trailer of FIG. 34 with adeployed safety wall;

FIG. 37 is a cross sectional view of a safety trailer, with a deployedsafety wall, taken along line 37-37 of FIG. 39 according to anembodiment;

FIG. 38 is a cross sectional view of a safety trailer, with anundeployed safety wall, taken along line 37-37 of FIG. 38 ;

FIG. 39 is an isometric view of the safety trailer of FIG. 37 ;

FIG. 40 is a perspective view of the cable mechanism of the safety wallof FIG. 37 ;

FIG. 41 is a side view of a safety wall according to an embodiment;

FIG. 42 is a side view of a safety wall according to an embodiment;

FIG. 43 is a side view of a safety wall according to an embodiment;

FIG. 44 is a side view of a safety wall according to an embodiment;

FIG. 45 is a plan view of a safety trailer according to an embodiment;

FIG. 46 is an isometric view of the safety trailer of FIG. 45 ;

FIG. 47 is a side view of the safety wall attachment mechanism of FIG.45 according to an embodiment;

FIG. 48 is a plan view of a safety trailer according to an embodiment;

FIG. 49 is an isometric view of the safety trailer of FIG. 48 ;

FIG. 50 is a safety wall deployment mechanism for the safety trailer ofFIG. 48 ;

FIG. 51 is a partial isometric view of a safety trailer according to anembodiment;

FIG. 52 is a partial isometric view of the safety trailer of FIG. 51 ;

FIG. 53 is an undeployed safety wall according to an embodiment;

FIG. 54 is a deployed safety wall according to an embodiment;

FIG. 55 is a safety wall according to an embodiment;

FIG. 56 is a platform-mounted crane according to an embodiment;

FIG. 57 shows a crane-equipped safety trailer according to anembodiment;

FIG. 58 shows a deployed safety wall according to an embodiment;

FIG. 59 shows a safety trailer according to an embodiment;

FIG. 60 shows a deployed safety trailer according to an embodiment;

FIG. 61 is a cross section view of a deployed safety trailer taken alongline 61-61 of FIG. 63 according to an embodiment;

FIG. 62 is a cross sectional view of the deployed safety trailer of FIG.61 ;

FIG. 63 is an isometric view of the safety trailer of FIG. 61 ;

FIG. 64 is a cross sectional view of an undeployed safety trailer ofFIG. 61 ;

FIG. 65 is an isometric view of an undeployed safety trailer accordingto an embodiment;

FIG. 66 is an isometric view of the deployed safety trailer of FIG. 65 ;

FIG. 67 is an isometric view of an undeployed safety trailer accordingto an embodiment;

FIG. 68 is an isometric view of a deployed safety trailer of FIG. 67 ;

FIG. 69 is an isometric view of an undeployed safety trailer accordingto an embodiment;

FIG. 70 is an isometric view of a deployed safety trailer of FIG. 69 ;

FIG. 71 is a cross sectional view of an interface between a safety walland a platform according to an embodiment;

FIG. 72 is a cross sectional view of an interface between a safety wallsegment and another safety wall segment according to an embodiment;

FIG. 73 is a rear view of a locking mechanism between two expandable andretractable safety wall members according to an embodiment;

FIG. 74 is a side view of an interlocking mechanism between a safetywall and adjoining platform according to an embodiment;

FIG. 75 is a side view of an interlocking mechanism between adjoiningplatforms according to an embodiment;

FIG. 76 is a side view of an interlocking mechanism betweeninterconnecting safety wall segments according to an embodiment;

FIG. 77 is a cross section view taken along line 74-74 of FIG. 76showing a safety trailer according to another embodiment;

FIG. 78 is a cross section view taken along line 74-74 of FIG. 76showing a safety trailer according to the embodiment; and

FIG. 79 is an isometric view of the safety trailer according to theembodiment.

FIG. 80 is an isometric view of the safety trailer according to anembodiment.

FIG. 81 is a top right perspective view of an embodiment of a safetytrailer with rotating arm and channel members.

FIG. 82 is a perspective view of an embodiment of a safety trailer withrotating arm and channel members.

DETAILED DESCRIPTION General

In designing a vehicular impact resistant safety trailer, there are anumber of design considerations. For example, the safety trailer shouldhave sufficient mass and energy absorption to resist, withoutsubstantial displacement, the kinetic energy from the impact. Energyabsorption can be provided by shocks and inflated wheels. Deploying thetrailer on jack stands can minimize energy absorption by thesemechanisms. If there is insufficient mass and energy absorption, thevehicular impact can displace the safety trailer into the protected workarea, with concomitant injuries to maintenance personnel. On theoncoming traffic-facing end of the trailer, the safety trailer shouldhave crash attenuation devices to absorb energy from vehicularcollisions and lighting and illuminated message boards to provideadequate warnings to drivers. The traffic-incursion side of the safetytrailer, including any elongated safety wall, should be substantiallyplanar to avoid hang ups and snags with an impacting vehicle. Hang upsand snags can direct more kinetic impact energy into the wall and/orcause the vehicle to flip over the safety wall. The safety wall, itself,should have sufficient structural strength (e.g., a relatively hightensile and compressive yield strength) and elastic deformation toresist the kinetic energy of vehicular impact. The height of the safetywall should be high enough to inhibit entry of an impacting vehicle intothe protected work area by climbing, flipping, and careening over thewall. The safety trailer should have embedded equipment and associatedplumbing/wiring to assist workers in the work area. Examples includegenerators, lighting, compressors, batteries, water misters, watersprayers, pumps for liquid removal from the protected work area, fans,tool storage, and the like. The safety trailer should be readily, easilyand conveniently deployable. The tractor should, for instance, be ableto engage the hitch of the safety trailer from multiple directions,rather than only from one specific orientation. The safety trailershould have an air ride on the rear platform to permit either side orthe entirety of the front and/or rear platforms to be raised or lowered.The various configurations and embodiments disclosed herein have one ormore of these features.

Rotatable Arm Safety Wall Trailer Designs

In a number of safety trailer embodiments, the safety wall rotates toeither side of the trailer, by a rotatable arm aligned (in asubstantially vertical plane) substantially with the longitudinal axisof the safety trailer. Each of the rotatable arms, when deploying thesafety wall, can drop into, or engage, a channel and/or retainer toprovide added strength to the safety wall.

FIGS. 1-2 depict a safety trailer according to an embodiment of thisdesign. The trailer 100 includes first and second platforms 104 and 108interconnected by an extendible and retractable safety wall 112. Thesafety wall 112 includes first and second sections 120 and 124, with thefirst section 120 telescopically receiving the second section 124. FIG.1 depicts the safety wall in an undeployed configuration while FIG. 2depicts the safety wall in a deployed configuration. In the undeployedconfiguration, the safety wall is retracted while in the deployedconfiguration the safety wall is extended to define a protected workarea for maintenance personnel. The first and/or second platforms 104and 108 each include a ballast 116, which is positioned on the trailer100 to offset, at least substantially, the weight of the safety wall112.

FIGS. 8 and 9 depict how the telescopically engaged first and secondsections 120 and 124 of the safety wall 112 are extended and retracted.The safety wall includes a plurality of interconnected structuralmembers, typically in the form of tubes. FIGS. 8 and 9 depict anexemplary structural member in the safety wall. Both figures depict atube-in-tube arrangement with very tight clearance (e.g., less thanabout 5 mm) between the engaged tubes. FIG. 8 depicts a circular orarcuate structural tube cross section while FIG. 9 depicts a rectangulartube cross section.

With reference to FIGS. 3-7 , a number of possible safety wall deployedmechanisms are depicted for various trailer embodiments. In all of themechanisms, the safety wall rotates, via a rotatable arm, about arotation axis (in a substantially vertical plane containing also thelongitudinal axis of the safety trailer) and the safety wall isexpandable via a telescopic mechanism similar to that of FIGS. 1-2 and8-9 . FIG. 3 depicts a safety trailer 300 configuration withindependently movable (rotatable) first and second safety walls 304 and306. Each first and second safety wall 300 and 306 includes a pair ofcorresponding rotating arms 308, with a rotating arm of each wall 300and 306 rotating about a common pivot 320, the rotational axis 350 ofwhich lies in a vertical plane containing the longitudinal axis of thesafety trailer 300. The ends of the walls 304 and 306 connect to adifferent pivot. The first and second safety walls 300 and 304 may bepositioned one-on-top-of-the-other on a common side of the safetytrailer 300 (not shown) to define a partially protected work spacehaving ingress or egress to workers and equipment or on separate sidesof the safety trailer 300, as shown in FIG. 3 , to define a fullyprotected and enclosed work space between the walls. FIGS. 4-5 depictanother safety trailer 400 configuration. The safety wall 404 isrotatable, by rotating arms 408 and about front and rear pivots 420, toeither side of the safety trailer 400. The wall includes upper and lowergussets 412 to provide additional structural support to the exteriorpanel 416. FIGS. 81 and 82 depict further features of the embodiment ofthe safety trailer shown in FIGS. 4-5 . Like numerals will be used toidentify elements already identified in FIGS. 4-5 . Thus, in FIGS. 81and 82 , the safety trailer 400 has a rotating arm 408 connected betweena pivot 420, and a safety wall 404. The safety wall 404 is rotatable bythe rotating arm 408 to either side of the safety trailer 400. Thesafety wall 404 may include upper gussets 412 to provide additionalstructural support to the exterior panel 416. FIGS. 81 and 82 also showchannel members 8100. Each of the channel members 8100 have a protrudingbeam 8101 and an endcap 8102 with lip 8103, which define an open channel8104. As can be seen in both FIGS. 81 and 82 the rotating arm 408 dropsinto, or engages with, the open channel 8104 to provide added strengthto the safety wall. Specifically, the rotating arm 408 is capturedbetween the rear wall 8105 of the platform, the protruding beam 8101 andthe endcap 8102 and thereby is prevented from moving which strengthensthe safety wall. It should be appreciated that while only a frontportion of the safety trailer 400 is shown in FIGS. 81 and 82 , similarchannel members 8100 are provided on the rear portion of the safetytrailer 400, and that a rear rotating arm 408 similarly engages with thechannel members 8100 provided on the rear portion. The lip 8103 assistsin the rotating arm dropping into the channel 8104 by ensuring adequateclearance for the arm to drop in.

FIGS. 6-7 show yet another safety trailer 600 design according toanother embodiment. The safety trailer 600 includes first and secondtelescopically expandable and retractable safety walls 604 and 608attached, by rotatable arms 610, to a common pivot 612, the rotationalaxis 650 of which typically is substantially parallel to, and may lie ina substantially vertical plane with, a longitudinal axis 700 of thesafety trailer 600. The other ends of the walls 604 and 608 connect to adifferent common pivot, positioned, relative to pivot 612, to provide acommon axis of rotation. FIG. 6 shows the first and second safety walls604 and 608 being positioned, or deployed, on opposing sides of thesafety trailer to define a fully enclosed and protected work spacebetween the safety walls. FIG. 7 shows the first and second safety walls604 and 608 stacked one-on-top-of-the-other to define a wall that istwice as high as each of the first and second safety walls 604 and 608and a partially enclosed and protected work space.

FIGS. 10-13 depict a safety trailer 1000 configuration according toanother embodiment. The safety trailer 1000 includes first and secondplatforms 1004 and 1008 and an intervening, rotatably positionable,safety wall 1012. Each of the first and second platforms 1004 and 1008include ballast 116 that is movably positionable between the opposingfirst and second sides of the safety trailer 1000 via rails 1016.Typically, the ballast is positioned on the opposite side of the safetytrailer 1000 from the deployed safety wall 1012. The safety wall 1012includes first and second “V” shaped rotatable arms 1200, each rotatablearm 1200 being connected to a different pivot 1050 and having a trafficincursion facing panel 1300. The respective pivots 1050 of the first andsecond rotatable arms 1200 typically lie along a common rotation axis,which is generally the longitudinal axis 1100 of the safety trailer1000. The width “W.sub.W” of the safety wall 1012 is preferably withinabout 25% of, more preferably within about 10% of, and even morepreferably substantially the same as, the width “W.sub.B” of the bed ofthe safety trailer 1000. This width preferably is at least about 4 feet,more preferably at least about 6 feet and even more preferably rangesfrom about 6 to about 12 feet.

Flip Up/Down Safety Wall Trailer Designs

In a number of safety trailer embodiments, the safety wall flips up ordown when deployed. In these embodiments, the axis of rotation of thesafety wall is spatially offset from (to one side of) a longitudinalaxis of the safety trailer. Stated another way, a plane containing boththe axis of rotation of the safety wall and longitudinal axis of thesafety trailer is not vertical but transverse to a vertical plane. Inone configuration, the plane containing both axes is substantiallyhorizontal.

With reference to FIGS. 14-16 , a safety trailer 1400 according to anembodiment of this design includes first and second platforms 1404 and1408 with a safety wall 1412 rotatably engaged with, and positionedbetween, the platforms. As can be seen from FIGS. 14-15 , each end ofthe safety wall engages, via a respective short rotatable arm 1420, acorresponding pivot 1424, about which the safety wall 1412 rotatesupwards for deployment or downwards for undeployment/transit. An axis ofrotation defined by the pivots 1424 is substantially parallel to, but isoffset to one side of, a longitudinal axis 1500 of the trailer 1400. Ascan be seen in FIG. 16 , the first and second platforms 1404 and 1408each include protruding supports 1600 to support the wall when rotateddownwards for transit. FIG. 14 further shows that the upper portion ofthe deployed wall can be supported/anchored by protruding pins or dowels1450. The height of the deployed safety wall is substantially the sameas the width of the trailer bed.

With reference to FIGS. 17-19 , a safety trailer 1700 according to anembodiment includes first and second platforms 1704 and 1708 with asafety wall 1712 rotatably engaged with, and positioned between, theplatforms. As can be seen from FIGS. 17-18 , each end of the safety wallengages, via a respective short rotatable arm 1720, a correspondingpivot 1724, about which the safety wall 1712 rotates downwards fordeployment or upwards for undeployment/transit. As can be seen in FIG.19 , the first and second platforms 1704 and 1708 each include a firstset of holes 1900 for dowels to support the wall when rotated upwardsfor transit and a second set of holes 1950 for dowels to support thewall when deployed. The height of the deployed safety wall issubstantially the same as the width of the trailer.

With reference to FIGS. 20-22 , a safety trailer 2000 according to anembodiment includes first and second platforms 2004 and 2008 with asafety wall 2012 rotatably engaged with, and positioned between, theplatforms. The safety wall 2012 is, in cross-section, rectangularlyshaped due to multiple vertical and horizontal tiers of supportingstructural members (not shown), such as the structural design of FIG. 41or 44 . A planar face 2100 of the safety wall 2012 faces vehiculartraffic. The safety wall rotates upwards for undeployment/transit anddownwards for deployment. The holes 2200 at each end of the safety wall2012 are at the interface of the safety wall and adjacent platform andtherefore pass through both the end of safety wall and the adjacent faceof the platform. The holes, when aligned, receive removable dowels. Morespecifically, when (in FIG. 21 ) the safety wall 2012 is undeployed fortransit, only the aligned set of holes at the top of the adjacentplatform receive a dowel to secure the safety wall for transit. When (inFIG. 20 ) the safety wall 2012 is deployed, all four sets of alignedholes receive a dowel to secure structurally the safety wall to theadjacent platform against vehicular impact. To rotate the safety wall2012 upwards or downwards, only the set of holes at the point 2110 ofrotation receives a dowel; the other sets of holes do not. As will beappreciated, the number of sets of holes can be more or less and dependson numerous factors, primarily the strength specifications andrequirements for the interface.

With reference to FIGS. 74-76 , a safety trailer 7400 according to anembodiment includes first and second platforms 7404 and 7408 with asafety wall 7412 rotatably engaged with, and positioned between, theplatforms. The safety wall 2312 is, in cross-section and like safetywall 2012, rectangularly shaped due to multiple vertical and horizontaltiers of supporting structural members (not shown). The width of thesafety wall is substantially the same as the width of the trailer bedand the safety wall is able to rotate, about pivot 7508 (one of which ispositioned on each platform), to either side of the safety trailer. Inthis configuration, the outer skin 7504 of the safety wall faces upwardswhen not deployed. When the safety wall is deployed to the selected sideof the trailer, dowels are placed in the holes 7500 (which align withmatching holes in the platform) to impart structural rigidity to thesafety wall.

With reference to FIGS. 23-25 , a safety trailer 2300 according to anembodiment includes first and second platforms 2304 and 2308 with asafety wall 2312 rotatably engaged with, and positioned between, theplatforms. The safety wall 2312 is, in cross-section and like safetywall 2012, rectangularly shaped due to multiple vertical and horizontaltiers of supporting structural members (not shown). Discrete or separateplanar faces 2400 and 2402 of the safety wall 2312 face vehiculartraffic depending on the side of the trailer 2300 on which the wall 2312is deployed. The safety wall rotates to both sides of the trailer 2300for deployment, depending on the orientation of the trailer 2300relative to vehicular traffic. When traffic, for instance, is on theright side (facing forwards) of the trailer 2300, the safety wall 2312is deployed in the position shown in FIGS. 23 and 25 . When traffic ison the left side (facing forwards) of the trailer 2300, the safety wallis deployed in the position shown in FIG. 24 . The holes 2500 at eachend of the safety wall 2312 are at the interface of the safety wall andadjacent platform and therefore pass through both the end of safety walland the adjacent face of the platform. The holes, when aligned, receiveremovable dowels. When the safety wall 2312 is deployed, all four setsof aligned holes receive a dowel to secure structurally the safety wallto the adjacent platform against vehicular impact. To rotate the safetywall 2312 to the left or right, only the set of holes at the point 2410of rotation receives a dowel; the other sets of holes do not. As will beappreciated, the number of sets of holes can be more or less and dependson numerous factors, primarily the strength specifications andrequirements for the interface.

FIGS. 34-36 depict yet another safety trailer embodiment. The safetytrailer 3400 includes first and second platforms 3404 and 3408 with asafety wall 3500 rotatably positioned therebetween. The safety wall 3500rotates upwardly for deployment (FIG. 35 ) and downwardly forundeployment/transit (FIG. 34 ). The axis of rotation 3600 of the safetywall 3500 is substantially parallel to, but spatially offset from (notin a vertical plane with), a longitudinal axis 3604 of the safetytrailer 3400. To position the safety wall 3500 properly, the wall,before, during, or after rotation, also translates along its length anddrops downward (for deployment) or moves upward (fornondeployment/transit). Translation may be effected in any manner knownto one of ordinary skill in the art. An example would be to position thehinges 3410, about which the safety wall 3500 rotates, in a channel (notshown) on the reverse side of the safety wall 3500. The channel has aspecified length to position, at the end of translation, the hinges 3410and therefore the safety wall 3500 are at a desired height above theroad surface 3420.

FIGS. 61-64 depict yet another safety trailer embodiment. The safetytrailer 6100 includes first and second platforms 6104 and 6108 with asafety wall 6200 rotatably positioned therebetween. The safety wall 6200rotates downwardly for deployment (FIGS. 61-62 ) and upwardly forundeployment/transit (FIG. 64 ). The axes of rotation 6300 and 6304 ofthe safety wall 6200 are substantially parallel to, but spatially offsetfrom (not in a vertical plane with), a longitudinal axis 6400 of thesafety trailer 6100. In operation, the safety wall 6200 may beselectively positioned, by selecting an axis of rotation 6300 and 6304,on either side of the safety trailer 6100. By way of example, toposition the safety wall 6200 on the left side (FIG. 61 ) of the safetytrailer 6100, the axis of rotation 6300 is disengaged (such as byremoving first and second pins or dowels (not shown) from first andsecond holes 6250 a,b and/or matching holes in the first and secondplatforms at first and second interfaces 6350 a,b between the first andsecond platforms and the safety wall 6200. After disengagement, thesafety wall 6200 is rotated about rotational axis 6304 into the deployedposition on the left side of the safety trailer 6100. To position thesafety wall 6200 on the right side (FIG. 62 ) of the safety trailer6100, the axis of rotation 6304 is disengaged (such as by removing thirdand fourth pins or dowels (not shown) from first and second holes 6250c,d and/or matching holes in the first and second platforms at first andsecond interfaces 6350 c,d between the first and second platforms andthe safety wall 6200. After disengagement, the safety wall 6200 isrotated about rotational axis 6300 into the deployed position. To placethe safety wall 6200 in the undeployed/transit position, the first,second, third, and fourth sets of holes at the interfaces 6350 a-dand/or matching holes in the first and second platforms are aligned (byrotating the safety wall as needed) and dowels or pins inserted (ifabsent) into the aligned set of holes at each interface. When deployedon either side of the trailer, holes 6400 on either end of the wall 6200align with matching holes in the adjacent platform. Dowels or pins areinserted into the holes to provide structural strength to the interfacesbetween the platforms and walls.

In any of the foregoing embodiments, the safety wall may be lifted orretracted by one or more hydraulic cylinders. Referring to FIGS. 53-54 ,a safety wall 5300 rotatably engages a hydraulic cylinder 5400, which inturn rotatably engages a platform 5404. When the safety wall 5300 is notdeployed, the hydraulic cylinder 5400 is retracted, as in FIG. 53 . Inone configuration, the safety wall 5300 is substantially horizontal.When the safety wall 5300 is deployed, the hydraulic cylinder 5400 isextended, as in FIG. 54 . In one configuration, the safety wall 5300 issubstantially vertical. This embodiment may be used to make a safetywall deployable on one or both sides of a safety trailer.

Accordion-Like Safety Wall Trailer Designs

In a number of safety trailer embodiments, the safety wall retractsaccordion-like and has multiple axes of rotation that are transverse(typically substantially orthogonal) to a longitudinal axis of thetrailer.

Referring to FIGS. 26-28 , a safety trailer 2600 according to anembodiment of this design includes first and second platforms 2604 and2608 and an accordion-like safety wall 2612 positioned between, andengaged with, the first and second platforms 2604 and 2608. The safetywall 2612 includes a plurality of rotatably connected wall segments2704, 2708, and 2712, each being rotatable, about a vertical axis, withrespect to an adjacent wall segment or, as appropriate, an adjacentfirst or second platform. At each such interface, a hinge-likeinterconnection is typically employed. When the safety wall 1612 isdeployed as in FIG. 28 , one or more support members 2700 is used tobrace the rotatable interconnection between adjacent wall segments orwall segment and adjacent platform to inhibit rotation of the wallsegment in the event of vehicular impact. Brackets 2704 are positionedon either side of the rotatable interconnection to receive the supportmembers 2700.

Referring to FIGS. 29-31 , a safety trailer 2900 according to anotherembodiment includes first and second platforms 2604 and 2608 and anaccordion-like safety wall 2912 positioned between, and engaged with,the first and second platforms 2604 and 2608. The safety trailer 2900 issimilar to the safety trailer 2600 except that it contains moreinterconnected wall segments 2704. As will be appreciated, the number ofinterconnected wall segments 2704 is a function of the desired length ofthe safety wall (and size of the protected work area). Thus relative toFIGS. 26-31 , more or fewer wall segments may be employed.

Adjustable Inclination Safety Wall Designs

In a number of safety trailer embodiments, an orientation/inclination ofthe safety wall is adjustable to deploy or undeploy the safety wall.

FIGS. 37-40 depict a safety trailer according to an embodiment of thisdesign. The safety trailer 3700 includes first and second platforms 3704and 3708 and first and second safety walls 3712 a,b positioned between,and engaged with, the first and second platforms 3704 and 3708. Theinclinations of the safety walls 3712 a,b are vertical when deployed (asin FIG. 37 ) and nonvertical (or inclined relative to vertical) whenundeployed (as in FIG. 38 ). The inclination is adjusted by one or morearms 3800 (about which the respective wall rotates) and a double spooledcable reel 4000. The reel 4000 includes first and second cables 4004 and4008 each spooled around a separate spool. When the reel 4000 is rotatedclockwise, cable 4004 is tightened, or collected on the correspondingspool while cable 4008 is loosened, or spooled out on the correspondingspool, and when the reel 400 is rotated counterclockwise, cable 4008 istightened, or collected on the corresponding spool while cable 4004 isloosened, or spooled out on the corresponding spool. As cable 4004 iscollected and cable 4008 spooled out, the safety wall 3712 rotates inthe clockwise direction, and as cable 4008 is collected and cable 4004spooled out, the safety wall 3712 rotates in the counterclockwisedirection. In this manner, the safety wall 3712 is rotated into and outof the vertical position.

Slide Safety Wall Trailer Designs

In a number of safety trailer embodiments, the safety wall is moved fromside-to-side by sliding.

FIGS. 45-47 depict a safety trailer according to an embodiment of thisdesign. The safety trailer 4500 includes first and second platforms 4504and 4508 and safety wall 4512 positioned between, and slidingly engagedwith, the first and second platforms 4504 and 4508. The safety wall 4512is translated linearly back-and-forth between the left and right sidesof the safety trailer 4500 depending on the orientation of the safetytrailer relative to oncoming traffic. A forklift 4680, or other suitableequipment, mounted on the safety trailer when in transit, is used topush the safety wall 4512 to the desired position. The lineartranslation mechanism is depicted in FIG. 47 . The interface 4700between the first (and second) platforms 4504 (and 4508) includes achannel member 4704 and roller assembly 4708, which includes a rotatably(relative to the safety wall 4512) roller 4710 that rolls fromside-to-side in the channel 4712 of the channel member 4704. When thesafety wall 4512 is in the desired position relative to the first andsecond platforms 4504 and 4508, one or more dowels 4716 are insertedinto aligned pairs of holes, one hole being in the safety wall 4512 andthe other being in the adjacent platform, to hold the safety wall 4512in position in the event of a vehicular impact.

FIGS. 48-50 depict a safety trailer according to an embodiment of thisdesign. The safety trailer 4800 includes first and second platforms 4804and 4808 and safety wall 4812 positioned between, and engaged with, thefirst and second platforms 4804 and 4808. As in the case of safety wall4512, the safety wall 4812 is translated linearly back-and-forth betweenthe left and right sides of the safety trailer 4800 depending on theorientation of the safety trailer relative to oncoming traffic. Unlikesafety wall 4512, the safety wall 4812 is moved side-to-side by firstand second motors 5000 a,b positioned on either side of the safety wall4812 (or alternatively positioned inside of the adjacent platform). Eachof the motors 5000 a,b engages a respective gear 5004 a,b that, in turn,engages a toothed channel 5008 in a channel member 5010 positioned inthe adjacent platform. The motors each turn a respective gear to movethe safety wall 4812 back-and-forth in the channel 5008. Becausepositioning the motors 5000 a,b on the safety wall 4812 effectivelyrenders the safety wall usable on only one side of the trailer 4800 toresist vehicular impact, it is preferred that the gear 5004 a,b berotatably engaged with an adjacent end of the safety wall 4812 andrigidly engaged with a shaft (not shown) of the corresponding motor andthe motor be positioned inside of the respective first and secondplatform 4804 and 4812. In this manner, each of the opposing sides ofthe safety wall, when deployed, presents a substantially planar surfaceto intercept vehicular traffic incursions.

Lift Off Safety Wall Trailer Designs

In a number of safety trailer embodiments, the safety trailer has anon-board lifting device, such as a crane, to lift a safety wall from abed of the safety trailer and deploy the safety wall to a selected sideof the safety trailer.

FIGS. 51-52 and 71 depict a safety trailer according to an embodiment ofthis design. The safety trailer 5100 includes first and second platforms5104 and 5108 and safety wall 5112 positioned between, and engaged with,the first and second platforms 5104 and 5108. The safety trailer 5100includes a plurality of channels 5200 on each of the first and secondplatforms 5104 and 5108, which receive identically shaped tongues 7100on the reverse side of the safety wall 5112. When, as in FIG. 51 , thesafety wall is not deployed or in transit mode, the plurality ofchannels 5200 engage the tongues 7100 in the safety wall 5112,preventing removal of the safety wall from the bed defined by the firstand second platforms. To deploy the safety wall 5112, the first andsecond platforms 5104 and 5108 are moved apart, in the direction shownin FIG. 52 , to disengage the tongues 7100 from the correspondingchannels 5200 by moving the tongues linearly out of the channels. In oneconfiguration, independently operable brakes on the second platform areactivated to hold the second platform stationary while the firstplatform is moved in the direction shown. An on board crane 5220, beforeor during disengagement of the tongues from the channels, is attached tosafety wall, as shown in FIG. 52 , such that, when the tongues areremoved completely from the channels, the safety wall is suspended, bythe crane, above the road surface. The safety wall may then be moved toand engaged with, such as by placing dowels in aligned holes at theinterface of the safety wall and adjacent platform, the selected side ofthe safety trailer. To avoid hang ups with an impacting vehicle, thesafety wall is deployed with the planar side facing outwardly and thetongues facing inwardly, relative to the work area.

FIGS. 56 and 57 depict an embodiment of a safety trailer 5600 in which acrane 5220 is positioned on each of the first and second platforms 5704and 5708. One or more sections 5620 a,b of the safety wall 5612 areremoved by the cranes, by attaching the respective booms to differentattachment points. The safety wall sections 5620 a,b are positioned,either end-to-end on one side of and between or one on each side of, thefirst and second platforms 5604 and 5608. FIG. 58 depicts a safety wall5612 being positioned on one side of the safety trailer 5600.

FIGS. 69 and 70 depict a safety trailer 6900 according to anotherembodiment. The safety trailer 6900 includes first and second platforms6904 and 6908 and safety wall 6912 positioned between, and engaged with,the first and second platforms 6904 and 6908. The safety wall, as in theembodiment of FIGS. 51-52 and 71 , includes a plurality of channels 7000on each of the first and second platforms 6904 and 6908, which receiveidentically shaped tongues (not shown) on the reverse side of the safetywall 6912. When the first and second platforms 6904 and 6908 are movedapart to release the tongues from the corresponding set of channels,first and second cranes 5220 attach to respective attachment points onthe safety wall 6912 and lower the safety wall 6912 into position on thedesired side of the safety trailer 6900. Unlike the embodiment of FIGS.51-52 , the attachment points are on the upper edge, and not on thesides, of the safety wall 6912. When the wall is in the desired deployedposition, dowels, or some other attachment mechanism, can be used tosecure the safety wall 6912 to each of the first and second platforms6904 and 6908.

Slide Safety Wall Trailer Designs

In a number of safety trailer embodiments, the safety wall is deployedvia a sliding mechanism, between the safety wall and safety trailerand/or between different segments of the safety wall.

FIGS. 59-60 and 72 depict a safety trailer according to an embodiment ofthis design. The safety trailer 5100 includes first and second platforms5904 and 5908 and safety wall 5912 positioned between, and engaged with,the first and second platforms 5904 and 5908. First and second segments6000 and 6904 of the safety wall 5912 are interconnected by a matchingtongue 7200 and groove 7204 mechanism as shown in FIG. 72 . Thismechanism permits the first and second segments 6000 and 6904 to movelinearly, in the directions shown, relative to one another. In oneconfiguration, independently operable brakes on the second platform areactivated to hold the second platform stationary while the firstplatform is moved in the direction shown. When the safety wall 5912 isextended to the desired degree, dowels are inserted into holes 7208passing from a backside of and through the safety wall segment 6900 andinto the safety wall segment 6904. In this manner, the dowels areinserted and removed from the protected work area. In one configuration,the wall length is adjustable by positioning a plurality of holes 7208at selected intervals along a length of the safety wall 5912, as shownin FIG. 73 . In this manner, the safety wall is moved to the desiredposition, the holes in the wall segments 6900 and 6904 aligned, anddowels placed in the aligned holes. The edge 6040 may be beveled toreduce the likelihood of the edge becoming a snag to an impactingvehicle.

FIGS. 65-66 depict a safety trailer according to an embodiment of thisdesign. The safety trailer 6500 includes first and second platforms 6504and 6508 and safety wall 6512 positioned between, and engaged with, thefirst and second platforms 6504 and 6508. The safety wall 6512 issecured to the first and second platforms by a matching tongue (notshown) and groove 6600 mechanism, such as that shown in FIG. 72 . Thismechanism permits the first and second platforms, when moved apart, tomove, relatively to the safety wall 6512, linearly, in the directionsshown. In one configuration, independently operable brakes on the secondplatform are activated to hold the second platform stationary while thefirst platform is moved in the direction shown.

FIGS. 67-68 depict a safety trailer according to an embodiment of thisdesign. The safety trailer 6700 includes first and second platforms 6704and 6708 and safety wall 6712 positioned between, and engaged with, thefirst and second platforms 6704 and 6708. First and second segments 6800and 6804 of the safety wall 6712 are interconnected by a matching tongue6808 and groove mechanism, such as that shown in FIG. 72 . Thismechanism permits the first and second segments 6800 and 6804 to movelinearly, in the directions shown, relative to one another. The firstand second segments 6800 and 6804, while being movably (slidably)engaged relative to one another, are each fixidly or permanently engagedto a corresponding adjacent one of the first and second platforms 6704and 6708. In one configuration, independently operable brakes on thesecond platform are activated to hold the second platform stationarywhile the first platform is moved in the direction shown.

Safety Wall Structural Designs

A variety of safety wall structural designs will now be described. Allof the designs shall be described with reference to a latitudinal crosssection through the safety wall. These designs may be used for any ofthe safety walls discussed above.

Referring to FIG. 41 , a safety wall 4100 according to an embodimentincludes a plurality of spaced apart structural members 4104 extendinginto the page, with an outer skin 4108. The outer skin 4108 facestraffic and provides the planar surface to direct impacting vehiclesaway from the protected area, located interiorly of the wall 4100. Themembers 4104 define a two-dimensional matrix having multiple columns androws of members. At each end of wall, an end plate (not shown) isconnected to the members 4104. As will be appreciated, the number andpositioning of the members 4104 depend on the unique specifications andrequirements of the application.

FIG. 42 depicts another safety wall embodiment. Unlike the embodiment ofFIG. 41 , the safety wall 4200 includes a single row of spaced apartstructural members 4204 supporting an outer skin 4208.

FIG. 43 depicts another safety wall embodiment. Unlike the embodiment ofFIG. 42 , the safety wall 4300 includes a single row of interconnectedstructural members 434 supporting an outer skin 4308.

FIG. 44 depicts yet another safety wall embodiment. The safety wall 4400includes the structural members 4304 and outer skin 4308 of FIG. 43 butfurther includes force channeling members 4404, structural members 4408,and interior skin 4412 to dissipate any impacting force applied to theouter skin 4308. As will be appreciated, the force channeling members4404, in one configuration, are gussets that direct some of theimpacting force to the structural members 4408 and interior skin 4412.

Other safety wall configurations may also be employed. By way ofexample, the safety wall configuration disclosed in copending U.S.application Ser. No. 12/533,931, filed Jul. 31, 2009; Ser. No.12/347,458, filed Dec. 31, 2008; and Ser. No. 12/347,467, filed Dec. 31,2008, each of which is incorporated herein fully by this reference. Aswill be appreciated, other features disclosed in these applications maybe applied to any of the embodiments disclosed herein.

Other Features

FIG. 55 shows that a configuration of a safety wall 5500 that may beused with any of the above embodiments. Each end of the safety wall 5500includes first and second elongated slots 5504 and 5508 at either end ofthe safety wall 5500. The slots 5504 and 5508 receive a correspondingpin 5512, which engages a corresponding one of the first and secondplatform. In the configuration shown, a pair of dowels 5520 ispositioned between each end of the safety wall 5500 and a respective oneof the first and second platforms. When the safety wall is not deployed,the dowels 5520 are in first positions 5530 a,b and, when the safetywall is deployed, one set of the dowels 5520 nearest one edge is removedso that the other set of dowels 5520 become the axis of rotation of thesafety wall, as discussed above. As the safety wall approaches avertical orientation, the unremoved set of dowels 5520 move to secondpositions 5540 a orb. The length “L” of each slot determines a length of“drop” of the wall when the wall is deployed to a vertical orientation.In other words, if the length “L” is 2 feet, the pair of dowels on thelower edge of the deployed safety wall will move into the secondposition 5540 a (assuming that edge 5550 is the lower edge and edge 5560is the upper edge), causing the wall to move downwardly 2 feet.

FIGS. 74-76 depict various interlocking mechanisms that may be used withany of the above embodiments. FIG. 74 depicts an interlocking set ofgrooves 7400 and teeth 7404 at the interface between a safety wall 7408and platform 7412. The interlocking set of grooves and teeth can notonly provide structural strength to the interface but also provide aguide mechanism to align the safety wall 7408 and platform 7412. FIG. 75shows the same interlocking mechanism used at the interface between twoplatforms when the safety wall is not deployed. In other words, when thesafety wall is removed and the two platforms connected, the platforminterfaces at either end of the wall are reverse images of each other,thereby permitting them to interlock to provide additional structuralstrength to the trailer. Thus, either end of the safety wall will haveteeth and grooves that are also reverse images of each other to permitthem to interlock with the opposing platforms. FIG. 76 shows a similarinterlocking mechanism for two adjoining safety wall segments. As willbe appreciated, the mechanisms of FIGS. 77-79 can also act as guidemechanisms to asset in positioning or aligning the adjacent safety wallsegments, platform and safety wall, or platforms in a desiredorientation relative to one another.

FIG. 32 depicts a safety trailer 3200 having a heavy roller 3250 on asecond (rear) platform 3208. The heavy roller 3250 may be used in lieuof or in addition to rubber tires. In one configuration, the rubbertires (not shown) are elevated above the road surface when the roller3250 is in use (or in contact with the road surface), and the roller3250 is elevated above the road surface when the rubber tires are in use(or in contact with the road surface). This may be effected, forexample, by a hydraulically actuated mechanism as will be appreciated bythose of ordinary skill in the art. The safety wall members 3220, whichare interconnected with one another and with the first and secondplatforms 3204 and 3208 are positioned on the bed defined by the firstand second platforms. This safety wall embodiment is discussed in thevarious copending U.S. applications referenced above. When the safetywall is positioned between the first and second platforms 3204 and 3208,the tractor 3280 pulls the safety trailer forward to provide a movableprotected work area. The roller 3250 is lowered by engage the roadsurface in this mode. For asphalting operations in which hot asphaltdecreases substantially the operational life of rubber tires, thisconfiguration is of particular benefit. Additionally, the heavy roller3250 can eliminate the need for a separate machine to compress the asapplied asphalt.

FIG. 33 depicts a safety trailer according to another embodiment. Thesafety trailer 3300 includes an aggregate director 3350 to directaggregate materials, such as dirt, gravel, and concrete into theprotected work area, when the safety wall is in position. Examples ofaggregate directors include hydraulically actuatable front dumps (whichdump material forwardly rather than rearwardly or to the side), concretechutes, concrete mixer, conveyors, and the like.

Any of the above trailer configurations and embodiments can have one orboth of the platforms configured to include a rear caboose, as disclosedby copending U.S. Pat. No. 7,572,022, which is incorporated herein bythis reference.

A number of variations and modifications of the invention can be used.It would be possible to provide for some features of the inventionwithout providing others.

For example in one alternative embodiment, the features of the aboveembodiments may be combined with the features of other embodimentsdisclosed above.

In another alternative embodiment, the truck or tractor is incorporatedinto the safety trailer to provide a mechanized vehicle having apermanently connected safety wall. In this embodiment, the truck ortractor is not removably hitched to a safety trailer.

FIG. 80 shows an alternate embodiment for the safety trailer. FIG. 80 isa view similar to the embodiment shown in FIGS. 51-58 . As in FIG. 80 ,the trailer 8000 is shown in its unloaded or deployed configuration. Thewall section 8010 has been removed from the loaded positions on top ofthe platforms 8020 and 8030 and connected between the platforms 8020 and8030 to form a protective barrier 8040. As can be seen in FIG. 80 , thetwo ballast boxes 8050, moveable along a fixed path, are placed on topof the platforms 8020 and 8030. The ballast boxes provide acounter-balance to the weight of the wall section 8010, which isdisposed on the opposite side of the platforms 8020 and 8030. FIG. 80shows a view of the safety trailer 8000 from the perspective of theprotected work zone area. As can be seen, the safety trailer creates aprotected work area 8060, which includes a space adjacent to the wallsection 8010 and between the platforms 8020 and 8030. The road or otherwork surface is exposed within the work zone area 8060. In theembodiment shown in FIG. 80 , a crane with a hook 8070 is shown forlifting the wall section 8010 from the platforms 8020 and 8030 duringassembly.

The present invention, in various embodiments, configurations, oraspects, includes components, methods, processes, systems and/orapparatus substantially as depicted and described herein, includingvarious embodiments, configurations, aspects, subcombinations, andsubsets thereof. Those of skill in the art will understand how to makeand use the present invention after understanding the presentdisclosure. The present invention, in various embodiments,configurations, and aspects, includes providing devices and processes inthe absence of items not depicted and/or described herein or in variousembodiments, configurations, or aspects hereof, including in the absenceof such items as may have been used in previous devices or processes,e.g., for improving performance, achieving ease and\or reducing cost ofimplementation.

The foregoing discussion of the invention has been presented forpurposes of illustration and description. The foregoing is not intendedto limit the invention to the form or forms disclosed herein. In theforegoing Detailed Description for example, various features of theinvention are grouped together in one or more embodiments,configurations, or aspects for the purpose of streamlining thedisclosure. The features of the embodiments, configurations, or aspectsof the invention may be combined in alternate embodiments,configurations, or aspects other than those discussed above. This methodof disclosure is not to be interpreted as reflecting an intention thatthe claimed invention requires more features than are expressly recitedin each claim. Rather, as the following claims reflect, inventiveaspects lie in less than all features of a single foregoing disclosedembodiment, configuration, or aspect. Thus, the following claims arehereby incorporated into this Detailed Description, with each claimstanding on its own as a separate preferred embodiment of the invention.

Moreover, though the description of the invention has includeddescription of one or more embodiments, configurations, or aspects andcertain variations and modifications, other variations, combinations,and modifications are within the scope of the invention, e.g., as may bewithin the skill and knowledge of those in the art, after understandingthe present disclosure. It is intended to obtain rights which includealternative embodiments, configurations, or aspects to the extentpermitted, including alternate, interchangeable and/or equivalentstructures, functions, ranges or steps to those claimed, whether or notsuch alternate, interchangeable and/or equivalent structures, functions,ranges or steps are disclosed herein, and without intending to publiclydedicate any patentable subject matter.

1. A safety trailer comprising: first and second platformsinterconnected by an extendible and retractable safety wall; wherein thesafety wall includes first and second sections, with the first sectiontelescopically received in the second section; wherein the safety wallis moveable from an undeployed configuration, wherein the safety wall isretracted, to a deployed configuration, wherein the safety wall isextended to define a protected work area for maintenance personnel;wherein the first and second platforms each include a ballast, which ispositioned on the trailer to offset, at least substantially, the weightof the safety wall; wherein the safety wall is moveable from a firstside of the first and second platforms to a second side of the first andsecond platforms by rotatable arms, wherein said rotatable arms engage achannel to provide added strength to the safety wall.
 2. The safetytrailer of claim 1, wherein the safety wall comprises a plurality ofinterconnected structural members in the form of tubes.
 3. The safetytrailer of claim 2, wherein the safety wall comprises a tube-in-tubearrangement with very tight clearance between the engaged tubes.
 4. Thesafety trailer of claim 2, wherein the tubes have a circular or arcuatecross section.
 5. The safety trailer of claim 2, wherein the tubes havea rectangular cross section.
 6. The safety trailer of claim 2, whereinthe first and second safety wall portions are positionedone-on-top-of-the-other on a common side of the safety trailer to definea partially protected work space having ingress or egress to workers andequipment.
 7. The safety trailer of claim 2, wherein the first andsecond safety wall portions are positioned on separate sides of thesafety trailer to define a fully protected and enclosed work space.
 8. Asafety trailer comprising: first and second platforms interconnected byan extendible and retractable safety wall; wherein the safety wallcomprises independently movable first and second safety wall portions,and each of the first and second safety wall portions includes first andsecond sections, with the first section telescopically received in thesecond section; wherein the safety wall is moveable from an undeployedconfiguration, wherein the safety wall is retracted, to a deployedconfiguration, wherein the safety wall is extended to define a protectedwork area for maintenance personnel; wherein the first and secondplatforms each include a ballast, which is positioned on the trailer tooffset, at least substantially, the weight of the safety wall; whereineach of the first and second safety wall portions includes a pair ofcorresponding rotating arms, with a respective rotating arm of each ofthe first and second safety wall portions rotating about common pivots,the rotational axis of which lies in a vertical plane containing thelongitudinal axis of the safety trailer; and wherein said rotatable armsengage a channel to provide added strength to the safety wall.
 9. Thesafety trailer of claim 8, wherein the safety wall is rotatable, by therespective rotating arms about the common pivots to either side of thesafety trailer.
 10. The safety trailer of claim 8, wherein the first andsecond safety wall portions are positioned one-on-top-of-the-other on acommon side of the safety trailer to define a partially protected workspace having ingress or egress to workers and equipment.
 11. The safetytrailer of claim 8, wherein the first and second safety wall portionsare positioned on separate sides of the safety trailer to define a fullyprotected and enclosed work space.
 12. The safety trailer of claim 8,wherein the safety wall comprises a plurality of interconnectedstructural members and an exterior panel.
 13. The safety trailer ofclaim 12, wherein the safety wall includes upper and lower gussets toprovide additional structural support to the exterior panel.
 14. Thesafety trailer of claim 8, wherein the safety wall comprises a pluralityof interconnected structural members in the form of tubes.
 15. Thesafety trailer of claim 14, wherein the safety wall comprises atube-in-tube arrangement with very tight clearance between the engagedtubes.
 16. The safety trailer of claim 14, wherein the tubes have acircular or arcuate cross section.
 17. The safety trailer of claim 14,wherein the tubes have a rectangular cross section.